Carburetor



Patented Apr. 24, 19.23.

UNIT-ED STATES FREDERIC E. BALDWIN., OF PHILADELPHIA, PENNSYLVANIA.

CARBURE'IOR.

Application filed April 16, 1921. Serial No. 461,795.

To all whom 'it may concer/i Be it known that I, FnnDniuoE. BALDWIN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented,

a new and useful Improvement in Carburetors, of which the followino' is a specification.

With some carburetors and especially those which have a fixed air entrance, it is found necessary to introduce additional fuel above the throttle valve to facilitate' starting the motor, to cause it to idle slowly, and lfor slow speed on the road. This device is frequently called an idling .device and in this application the appellation idling device?7 will be used to indicate such a device. Heretofore it has generally been customary to control the action of the idling by-pass by suction or vacuum conditions existing within the carburetor. This method of controlling the by-pass is not altogether satisfactory in that such control is not positive in its action, and consequently the by-pass sometimes continues to function after the time its action should have ceased. This results in the production of too rich a mixture and causes loading7 of the engine, which is objectionable.

The principal'objectof this invention is to overcome this difhculty, to control the fiow of fuel mechanically, instead of semiautomatically, and further to adjustably control the exact instant at which the fiow will cease.

Other objects of the invention will appear from the following description and the invention itself will be claimed at the end hereof but will berst described in connection with the accompanying drawings forming part hereof and in which- Figure 1 is an elevational view, partly in central section, of one form of carburetor in which my invention may be embodied.

Fig. 2 is a horizontal sectional view illustrating features of the invention, and taken on the line 2 2 of Fig. 3.

Fig. 3 is an elevational view showing part of a carburetor and illustrating this invention applied thereto, and

Fig. 4 is an elevational view, partly in section, on line 4-4 of Fig. 2 of a part of the carburetor fitted with mechanism embodying features of the invention.

In the drawing 1 is the throttle valve and 2 is a by-pass valve and it controls the fuel supplied to the by-pass which conducts fuel to the interior of the carburetor at a point in advance of the throttle when in a nearly closed position. The by-pass valve 2 is normally seated by aspring 3 so as to close the fuel duct a at 5 where the fuel duct enters the chamber 6 to which air is admitted at 7 and from which the by-pass 8 eX- tends to a point in advance of the throttle valve 1, when in closed position. 9 is alever connected intermediate of its ends with the pintle of the throttle valve 1 and adapted to open and close the throttle valve through the intervention of a link 10 that is operated by the driver. 11 are arms fitted with adjusting screws 12 which co-operate with a stop 13 projecting from the wall of the carburetor, and their purpose is to limit the movement of the throttle valve and parts connected therewith. The stem of the bypass valve 2 is connected to the forked end of a lever 14 pivoted intermediate of its ends to a stud 15 projecting from the carburetor casing, and this lever 14 is provided with a cam 16 shown as somewhat pointed. The point of an adjustable screw 17 carried by the lever 9 and fitted with a lock-nut 18 cooperates with the cam 16 to swing the lever 14 and cause the latter to unseat the bypass valve 2 against the force of its spring 3. The shape of the cam 16 is appropriate for causing the by-pass valve to be opened and permitted to close under the infiuence of its spring 3 with a quick and positive motion as the throttle valve is opened and closed. As shown the cam. 16 is carried on the lever 14 by a screw thread and held to place by a jam nut 19, and this is a matter of convenience in making adjustments although the parts can be properly adjusted in the first place in which case the adjustable features are not necessary.

When the throttle valve is closed the bypass valve is open and at the initial opening of the throttle valve the by-pass valve is closed and'upon closing movement of the throttle valve the by-pass valve is opened and these results are accomplished rapidljjvv and in co-ordination by the described operation of the mechanical means hereinabove explained. By reason of the described coordination of the operation of the throttle and by-pass valves, the supply of fluid fuel taken from the by-pass valve can be caused to cease at any desired position of the throttle valve.

lll.)

It will loel obvious to those skilled in the art to which the invention relates that modifications may be made in details of construction and arrangement Without departing from the spirit of the invention which is not limited to such matters or otherwise than as the prior art and the appended claims may require.

I claim:

1. A carburetor having in combination a mixture passage and ,a throttle valve therein provided with an operating lever, an idling ley-pass provided with means ifor admitting `fuel and thereto, and communicating with said mixture passage in advance 4et the throttle valve, a spring closed valve for controllii'ig said hyfpass, and pivotal lever 1 having one end eonnected with the last mentioned valve and the other end provided with a cam in range of the operating lever,

2. A carburetor having in combination a mixture passage and a Vthrottle valve therein, an idling ley-pass provided with means for admitting fuel and air therein, and com munieating with said mixture passage in advanee of the throttle valve, a valve for controlling said ley-pass and having its stem provided with a spring, a. stud projecting from the carburetor, a lever Ipivoted to the stud and having one of its ends connected with the stem of the last mentioned valve and the other of its ends provided with a cam, and an operating lever connected with the pintle of the throttle valve and adapted to Contact with and atuate Vthe cani.

3. A carburetor having in combination a mixture passage `and a throttle valve therein, an idling bypass provided with for admitting 'fuel and air thereto, and in @0m- `munication with Seid mixture passage in advance of the throttle valve, .means for .opf erating the throttle valve, a valve for ,een- HOllng the .admission ef fuel .te Seid idling' ivy-pass, a ,Spring fer eloeing the' fuel, trolling valve, va pivoted lever interposed between the fuel eontrolling valve and the throttle operating means and a cam carried by Said throttle `Op@rating fer eager-*- ine and @perenne Seid, `Notai lever te been said fuelcontrolling v" ve. i

FREDERIC E, BALDWN.- 

